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Evolutionary Trends in the Epithecate Scleractinian Corals Introduction

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Evolutionary Trends in the Epithecate Scleractinian Corals Introduction Evolutionary trends in the epithecate scleractinian corals EWA RONIEWICZ and JAROSLAW STOLARSKI Roniewicl, E. & Stolarski, J. 1999. Evolutionary trends in the epithecatc scleractinia" corals. -Acta Palaeomologica Po{onica 44, 2,131-166. Adult stages of wall ontogeny of fossil and Recent scleractinians show that epilheca was the prevailing type ofwall in Triassic and Jurassic corals. Since the Late Cretaceous the fre- quency of epithecal walls during adult stages has decreased. In the ontogeny of Recent epithecalc corals, epitheca either persists from the protocorallite to the adult stage, or is re­ placed in post-initial stages by trabecular walls that are often accompanied by extra­ -calicular skeletal clements. The former condition means that the polyp initially lacks the edge zone, the latter condition means that the edge zone develops later in coral ontogeny. Five principal patterns in wall ontogeny offossil and Recent Scleractinia are distinguished and provide the framework for discrimination of the four main stages (grades) of evolu­ tionary development oftheedge-zone. The trend ofincreasing theedge-zone and reduction of the epitheca is particularly well represented in the history of caryophylliine corals. We suggest that development of the edge-zone is an evolutionary response to changing envi­ rolmlent, mainly to increasing bioerosion in the Mesozoic shallow-water environments. A glossary is given of microstructural and skeletal tenns used in this paper. Key words: Scleractinia, microstructure, thecal structures. cpitheca, phylogeny. twa ROl1iewicz {erof/@Marda.pan.plj alUl jaros{aw Stolarski {swlacy@two,-da.pan.plj, lllstytl/t Pa/eobi%gii PAN, 11/. Twarda 51/55, PL-OO·818 WarsZGwa, Polalld. In Memory ofGabriel A. Gill, an Eminent Student ofCoral Structllres, our Colleague alld Friend Introduction Recent study of macroevolutionary trends in Scleractinia has focused on the develop­ ment of coloniality (Coates & Oliver 1974; Coates & Jackson 1985; Rosen 1986), microstructural changes of skeleton in their history (Roniewicz & Morycowa 1993), and phylogenetic differentiation based on molecular data (Romano & Palumbi 1996; Veron et al. 1996). In this paper we focus on some evolutionary aspects of the development of the edge-zone, a feature regarded by Vaughan & Wells (1943) and Wells (1956) as one of 132 Epi/hecute ScleraCIIIIIOm: RONJEWICZ & STOLARSKI the most important in the evolution of the Scleractinia. These aulhors remarked lhat development ofthe edge-zone led to a reduction ofthe epilheca and its replacement by other types ofouter wall. We auempllo trace this process using changes in wall suuc­ tures observed in the stratigraphic column and in the ontogeny ofsome Recent corals. Analysis of paleootological data has also led to the verification ofearlier views on the stratigraphic distribution ofepitheca. The majority of pre-Cenomanian genera have epithecalhololheca developed as a complete wall or at least as epilhccal rings (compare Koby 1881-1889. 1905: Frech 1890: Volz 1896: Vaughan & Wells 1943). The Late Triassic - Late Jurassic coral fau­ nas show a great taxonomic diversity of corals with solitary and phaceloid growth forms (compare Vaughan & Wells 1943), nearly all ofthem being epithecate forms. In the Late Triassic and Late Jurassic. when fine·grained shallow water calcareous sedi­ mentation de\'eloped, the phaceloid epithecate corals frequently predominated (Ro­ niewicz & Rooiewicz 1971: Stanton & Fltigel 1987, 1989: Geister & Lathuilihe 1991: Insalaco el 01. 1997). Questions arise: Whether the success ofthese corals lacking the edge-zone resulted from their special adaptations to the specific environment of the calcareous scdimentation? Which ofthe factors: physical, chemical or biological con­ trolled their development? What caused their reduction in the Late Cretaceous and continuation of this trend in the Cenozoic, resulting in their recent Iimitalion to relict cryptic or deep-water solhary forms? Though no defitite answers erist, we hope that our speculations will stimulate discussion. Institutional abbre\'ialiorui: GSA. Geologiscbe Bundesanstalt. Wien: ZPAL. Insti­ tute ofPaleobiology, Warsaw: UJ. Jagiellonian University, Cracow; MNHN, Museum National d'Histoire Naturellc, Paris: MS, Naturhistorischcs Museum. Humboldt Uni­ versitat. Berlin: NHM. Natural History Museum. London: USNM, National Museum of Natural History, Smithsonian Institution, Washington, D.C.: MGUWr, Geological Museum, Wrodaw University, Wroclaw. Epithecal walls: structure and terminology The term epitIJeco was used by Milne Edwards & Haime (I &48) for a 'skeletal sheath adhering to the external board of costae'. As examples of epitheca-bearing scler­ actinians they gave: Momlil'aJtia Lamouroux. 1821. BaJallophyllio Wood. 1844. and Flabellum Lesson. 1831 (in the lattcr case they noticed. however, the 'porcelain' ap­ pearance of thaI wall). In subsequent years, the term epilheca was used for alllrans­ versely folded walls ofsolitary and phaceloid corals. and a wall covering the lowercol­ any surface; for the epitheca of scleractinian colonies. a separate term holotheclI was later adopted (Alloiteau 1957), a term previously utilized in Rugosa and Tabulata (e.g.• Hudson 1929: Hill 1935). Alloiteau (1952) introduced a new term archaeotheca to de­ scribe the transversely folded 'septo-dissepimental' wall of the stylophyllids, pro­ cyclolitids. amphiastreids. and thecocyathids. Archaeotheca was. however. impre­ cisely defined (in fact. none ofthe above mentioned coral groups have a 'septo-disse­ pimental' wall) and structurally different walls were later described using this term (sec Stolarski 1995). Distinction between epithecal and archaeothccal walls was sup- ACfA PALAEONlULOOICA POLONICA (44) (2) 133 ported by Weyer (1975). He considered the walls developed subsequent to the septa to be epilhecal, e.g.• in scleractinian Monl/i\'a/lia caryophyl/ata Lamouroux. 1821. or in rugosan Ca/oslylis cribraria LindslrOm, 1868, while the walls developed prior to the septa to be archaoothecal, e.g.• Axosmilia or TheccH,:yalhlls maC/ms (Goldfuss. 1826) among Scleractinia. and Cyalhaxonia conlll Michelin, 1847 among Rugosa. As we show in this paper, the position of the cpithcca may vary in the ontogeny of particular species (it may be formed after or before the septa). Thus, we consider the above­ -presented distinction between epitheca and arch:leotheca unnecessary, and we sup­ port the earlier statement that the term arehaootheca should be rejected as imprecisely established and confusing (Stolarski 1995). Essential for understanding epitheca formation was a paper by Barnes (1972). He studied the epithecal wall in a range of Recent shallow-water zooxanthellate corals [/sophy//ia sinuosa (Ellis & Solander. 1786), Manici,la areaO/ala (Linnaeus. 1758), Montaslrea anl/u/oris (Ellis & Solander. 1786), Poriles aslreoides Lamarck.. 1816. Dip/oria slrigosa (Dana, 1846). Fa\'ia speciosa (Dana, 1846)] and showed that it is a two-fold, fibrous structure developing in the marginal zone of the polyp body. Barnes (1972) noted also a comparably structured wall in the azooxanthellate Gordineria. Re­ cent studies of the family Aabellidae (Caryophylliina). traditionally considered as epithecate corals. have shown that the wall of most genera is trabecular (margino­ thecal). and thus essentially different in structure from epitheca (Stolarski 1995). This encouraged us to outline precise criteria for the differentiation between epithecal walls and similar but non-homologous walls in fossil and Recent Scleractinia. Place of formation Epitheca is formed in an anatomically specialized soft tissue marginal fold. the lappet cavity (Barnes 1972). The initial, outer layer (primary layer sellSIl Barnes 1972) is fonned in the apical pan of the lappet cavity. The inner layer may form initially in lhe lappet or behind it in a secreting zone of the body wall resulting in formation of. re­ spectively, thin (pellicular) or thick (mature) epitheca (see also Stolarski 1995: fig. I; Stolarski 1996: fig. I). Morphology Epitheca constitutes the external and often the distalmost part of the corallum (Fig. IA). Generally. it is covered with transverse incremental Hoes and folds but sometimes also bears longitudinal striations (Fig. 2B. C. F). During ontogeny, epilheca may differ in rates ofdevelopment from other skeletal elements (Fig. 3A-D). Growth ofepitheca may exceed that of radial elements. thus re· suiting in the fonnation of a distal tube of epitheca (Fig. 38): or it may equal the growth ofradial elements (Fig. 3D); or be retarded in comparison with the latter (Figs 3C, IIC), resulting in epitheca coming in contact with septa-derived structures (e.g.. septotheca. synapticulotheca) and epicostal dissepiments. Epitheca may be developed as a continuous layer covering the whole corallum or its proximal pan (ontogeny of dendrophylliids); it may be reduced to epithecal rings (e.g., in Cretaceous Mom/i­ va/tia, Fig. JOB, or in Recent Trochoc}'athus rawson; Pourtales. 1874, Fig. 12E): or it may form 'holothecal rings' (e.g.• in Monicina af?olata. see Fabricius 1964). In corals with continuous epitheca, the living tissue is confined to the narrow lone at the .34 Epllh«ot~ uluaetimans: RONlEWlCZ & SlOLARSICI A outer epithecaI layer (oon-trabecular) Fig. I. Eplthecal YS. marginothe<:a1 wall - transverse seclWns. A. Epitheca in Gardinma with thick cpil~a1 slcrcome. B. Marginothel:a in f"/ulHlIllm With thICk inlc~ptaI stcrcornc. Modified from Stolarski (1997). calicular edge. and the rest
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